<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=<div>>, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    div，p，h1{
        color:red;
    }
    </style>
</head>
<body>
    <div>div</div>
    <p>p</p>
    <h1>h1</h1>
</body>
</html>